The invention discloses a plant wound protecting agent. The plant wound protecting agent comprises the following components in weight percentage: 20-30% of polyvinyl acetate emulsion, 10-15% of Vaseline, 30-45% of potassium humate, 15-20% of fulvic acid, 2-5% of compound microbial bacterial preparation, 0.04-0.06% of a-naphthylacetic acid and 0.5-1.5% of polyvinyl alcohol. The invention further discloses a woundplast using the plant wound protecting agent. The woundplast using the plant wound protecting agent comprises a band reel and a plurality of bands, wherein a protective layer is arranged on each band; double-sided adhesive layers/layer are/is arranged on the two sides or one side of the protective layer; a connecting belt is arranged between two adjacent bands; the protective layer is coated with the plant wound protecting agent; the protective layer is covered by a release paper layer; and peripheral edges of the release paper layer and the protective layer are bonded and fixed. The plant wound protecting agent is simple in formulation; and the woundplast is simple in structure, convenient to use, low in cost, low in manpower cost and low in labor intensity.